Paper-pulp-screen machine



H. T. BAKER AND J. D HASKELL.

PAPER PULP SCREEN MACHINE.

APPLICATION FILED MAY 4, 192].

1A29g707 r PatentedSept. 19,1922.

2 SHEETSSHEET I.

WITNESS: INVENTORS,

7/1, ATTORNEY.

H. T. BAKER AND I. D. HASKELL.

PAPER PULP SCREEN MACHINE.

APPLICATION FILED IIIAY 4.192].

PatentedSept. 19, 1922.

2 SHEETS-SHEET 2.

IN VEN TORS WITNESS:

7%,.) ATTORNEY.

Patented Sept. 19, 11922.

BAZWW mr. mania AND JOHN n. 1:

sKEtL, or narrow, OHIO.

PAI ER-PULP-SCREEN MACHINE.

Application filed May 1-,

T 0 aZZ whom it may concern: 7

Be it'known that we, HAROLD T. BAKER and, JOHN D. HAsKELL, citizens ofthe United States, residing at Dayton, in the county of Montgomery andState of Ohio,

have invented certain new and useful Improvements in Paper-Pulp-ScreenMachines, of which the following is a specification.

The principal object of our inventionis to provide a machine for soscreening fibrous material that fibers of required sizes only will passthrough the screen plates as accepted material, while the oversizefibers or bundles of fibers and dirt will beforced back from the screenplates and diverted to an outlet for the rejections or tailings.

Other important and incidental objects will be brought out in thefollowing specification and particularly set forth in the subjoinedclaims.

In the accompanying drawings illustrating our invention, Figure 1 is alongitudinal view of the outer casing that is broken away to show thescreen sections, rotor, stock inlet, rejection outlet and shower. Figure2 is a cross section taken on the line A-A of Figure 1, showing theelliptical casing, circular rotor, adjustable accepted-stock outlet andscreen sections. Figure 3 is an end elevation of the machine lookingtoward the stock inlet. Figure 4 is an end elevation of the machinelooking toward the tailing discharge. And Figure 5 is a perspective viewof a single screen section.

Throughout the specification and drawings, similar reference charactersdenote.

corresponding parts.

'In a detailed description of the preferred form of embodiment of ourinvention, the numeral 1 designates the outer casing or shell of themachine, which is approximately elliptical in cross section. (SeeFigures 1 and 2.) This casing is supported by feet 2 that projectdownwardly from its lower section 3. The latter has a peripheral flangeportion 4 that is secured to a similar flange portion 5 on the upperhalf section 6 of said casing or shell 1, by bolts 7, whereby. the twosections are firmly secured together.

At one end the casing 1 has aconvolute inlet portion 8 .to receive anddistribute the entering stock, and at its other end an outlet 'portion 9for the rejections or tailings. (See Figures 1, 3 and 4.)

Support d upon bearings 10 at each end of the machine, is a shaft 11 onwhich is 1921. Serial No. 466,663.

mounted an impeller or rotor 12 having a series of radial blades 13.Between the outer ends of each pair of blades 13 there is secured bybolts 14:, a trough-shaped frame 15 having curved ends and divided intosections by curved partition pieces 16. (See Figures 2 and 5.) Fastenedin the bottom portion of each section of the frames 15, is a screenplate 17. Fast on the outer end of the shaft 11 is a double pulley 18which re- I ceives a belt (not shown) by which the rotor blades 13 thatcarry the screen frames 15, are rotated.

' Diluted fibers made from fibrous material reduced to fibers by. eithermechanical or chemical means, are admitted to the interior of the rotorl2through the inlet 8, and by a curved deflector 19, are directed alongthe interior surfaces of the screen plates 16. The impeller 12 causesthe stock to revolve with it, and due to centrifugal force, the fiberswhich are of such size as to pass through the screen slots, will beforced through them together with the water. This screened stock fillsthe space between the screen plates 16 and the interior surface of theoutside casing or shell 1, and by the rotor blades which project intothis space, said stock is caused to revolve. This produces a furthercentrifugal force which causes a partial vacuum on the outside of thescreen plates.

At two points, designated by the letters d and b in Figure 2, thecircumference of the outside shell 1 approaches the ends of its minoraxis. At these points, therefore, there will be a narrow clearancebetween the shell and the blades of the rotor. Screened stock will becarried into this space, where itwill be compressed to cause acounterflow of stock, or, in other words, an inward flow as indicated bythe arrows'at the points a and b. This reversal of flow will havesufiicient force to dislodge the large or oversize fibers and dirt thattend to plug or clog the slots in the screen plates 15 and cause them tobe carried along by the incoming unscreened stock toward the tailingdischarge outlet 9, parallel to the shaft 11. By this counterflow of thescreened stock, the slots in the screen plates will be kept clean andopen at all times to permit the required sizes of fibers to be freelypassed through them. After passing'through the screen plates, thedesired fibers willbe caran accepted stock outlet 20. The size of theopening in the latter may be adjusted or varied by a gate valve 21'thatmay be raised or lowered by a screw 22 to which a hand,

'wheel 23 is attached. (See Figure 2 The pression points a and 1) beforereferred to, a ring 24 is secured to the inner periphery of the outershell at the tailing discharge end of the rotor to separate the spacebetween it and the screen plates into two compartments 25 and 26. (SeeFigures 1 and 2.) The accepted stock that does work back through thescreen plates is caught in the compartment 25 and discharged through theoutlet 20 A shower pipe 27 is also provided to'spray water upon therejections or tailings at the end of the rotor 12, to give them a finalwashing for the purpose of removing any fine fibers that may adhere tothem. (See Figure 1.)

We do not wish to be limited to the details of construction andarrangement herein shown and described, and any changes or modificationsmay be made therein within the scope of the subjoined claims.

Having described our invention, we claim 1. In a paper-pulp screenmachine, the combination with an outer casing approximately ellipticalin cross section, of fiber screening means rotatable within said casing,a stock inlet to the latter, an accepted stock outlet and a tailingdischarge outlet from said casing, the wall of the outer casingapproaching the screening means at two points to form compression spacesbetween the screening means and the casing wall for the purposespecified.

2. In a paper-pulp screen machine, the

combination with an outer casing approximately elliptical in crosssection, of a circular rotor rotatable within said casing, curved screenplates forming the outer periphery of said rotor, means for admittingstock to said rotor, a chamber between the screen plates and the casingwall to receive the required sizes of fibers that pass.

through said plates, the wall of the casing converging toward the screenplates at two points to lessen the size of said chamber at those pointsfor the purpose specified, an outlet from said rotor for the oversizefibers and dirt, and an outlet from said chamber.

the casing converging toward the screen plates at two points to lessenthe size of said chamber at thosepoints for the purpose specified, anoutlet'from said rotor for the oversize fibers and dirt, and anadjustable outlet from said chamber for the fibers that pass through thescreen plates.

4. In a paper-pulp screen machine, the combination with an outer casingapproxi-. mately elliptical in cross section, of a circular screenrotatable within said casing, means for admitting stock to said screen,a chamber between the screen and the casing wall to receive the requiredsizes of fibers that pass throughvthe screen, the wall of the casingconverging toward the screen at two points to lessen the size of saidchamber at thosepoints for the purpose specified,

an outlet from said screen for the oversize fibers and dirt, an outletfrom said chamber for the fibers that pass through the screen, and apartition ring in said chamber near said outlets, for the purposespecified.

5. In a paper-pulp screen machine, the combination with an outer casingapproximately elliptical in cross section, of a circular screenrotatable within said casing, means for admitting stock to said screen,a chamber between said screen and the casing wall to receive therequired sizes of fibers that pass through the screen, the wall of thecasing converging toward the screen at two points to lessen the size ofsaid chamber at those points for the purpose specified, an outlet fromsaid chamber for the fibers that pass through the screen, an outlet fromthe latter for the oversize fibers and dirt, anda shower pipe near saidlast named outlet to spray water upon said oversize fibers and dirtprior to their discharge through said outlet, for the purpose specified.I

In testimony whereof we have hereunto set our hands this 2nd day of May,1921.

' HAROLD T: BAKER.

JOHN D. HASKELL.

Witness:

HOWARD S. SMITH.

